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All answers having "Civil War battle site" as clue:

3 Character Answers:

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RHO



6 Character Answers:

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SHILOH



7 Character Answers:

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BULLRUN



8 Character Answers:

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ANTIETAM

MANASSAS



10 Character Answers:

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WILDERNESS



11 Character Answers:

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CHICKAMAUGA



15 Character Answers:

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MISSIONARYRIDGE